Agent Sergei

Agent Sergei (died 1969) was a Soviet KGB agent and defector.

Biography
Sergei attended the KGB Academy with Natalya Ivanova, and the two had an affair before graduating and becoming colleagues. In 1969, they defected when they discovered a conspiracy in the USSR to bring the United States into a nuclear world war, and he worked with Ivanova to investigate the KGB's strange activities; they first met in London before heading to Tunguska to investigate further. Sergei helped to smuggle nuclear fuel rods onto a truck from a Soviet container ship, using the rods to destroy a strange Soviet tunnel network which appeared to have been created by extraterrestrials. Later, Sergei vanished, with some believing that he had been infected by spores from the Blisk aliens at their base and died as a result.